3 * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/fifo.h"
27 #define GXF_AUDIO_PACKET_SIZE 65536
29 typedef struct GXFStreamContext {
30 AVCodecContext *codec;
31 AVFifoBuffer audio_buffer;
51 typedef struct GXFContext {
53 uint32_t material_flags;
54 uint16_t audio_tracks;
56 int64_t creation_time;
57 uint32_t umf_start_offset;
58 uint32_t umf_track_offset;
59 uint32_t umf_media_offset;
60 uint32_t umf_user_data_offset;
61 uint32_t umf_user_data_size;
63 uint16_t umf_track_size;
64 uint16_t umf_media_size;
69 GXFStreamContext streams[48];
72 typedef struct GXF_Lines {
78 /* FIXME check if it is relevant */
79 static const GXF_Lines gxf_lines_tab[] = {
80 { 480, 1 }, /* NTSC */
81 { 512, 1 }, /* NTSC + VBI */
83 { 608, 2 }, /* PAL + VBI */
88 static const AVCodecTag gxf_media_types[] = {
89 { CODEC_ID_MJPEG , 3 }, /* NTSC */
90 { CODEC_ID_MJPEG , 4 }, /* PAL */
91 { CODEC_ID_PCM_S24LE , 9 },
92 { CODEC_ID_PCM_S16LE , 10 },
93 { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
94 { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
95 { CODEC_ID_DVVIDEO , 13 }, /* NTSC */
96 { CODEC_ID_DVVIDEO , 14 }, /* PAL */
97 { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
98 { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
99 { CODEC_ID_AC3 , 17 },
100 //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
101 { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
102 { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
103 { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
107 #define SERVER_PATH "/space/"
108 #define ES_NAME_PATTERN "ES."
110 static int gxf_find_lines_index(GXFStreamContext *ctx)
114 for (i = 0; i < 6; ++i) {
115 if (ctx->codec->height == gxf_lines_tab[i].height) {
116 ctx->lines_index = gxf_lines_tab[i].index;
123 static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
125 for (; to_pad > 0; to_pad--) {
130 static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
135 size = url_ftell(pb) - pos;
137 gxf_write_padding(pb, 4 - size % 4);
138 size = url_ftell(pb) - pos;
140 curpos = url_ftell(pb);
141 url_fseek(pb, pos + 6, SEEK_SET);
143 url_fseek(pb, curpos, SEEK_SET);
147 static int64_t updateSize(ByteIOContext *pb, int64_t pos)
151 curpos = url_ftell(pb);
152 url_fseek(pb, pos, SEEK_SET);
153 put_be16(pb, curpos - pos - 2);
154 url_fseek(pb, curpos, SEEK_SET);
158 static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
160 put_be32(pb, 0); /* packet leader for synchro */
162 put_byte(pb, type); /* map packet */
163 put_be32(pb, 0); /* size */
164 put_be32(pb, 0); /* reserved */
165 put_byte(pb, 0xE1); /* trailer 1 */
166 put_byte(pb, 0xE2); /* trailer 2 */
169 static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
172 int size, starting_line;
175 ctx->p_per_gop = ctx->pframes / ctx->iframes;
176 if (ctx->pframes % ctx->iframes)
179 ctx->b_per_gop = ctx->bframes / ctx->pframes;
180 if (ctx->p_per_gop > 9)
181 ctx->p_per_gop = 9; /* ensure value won't take more than one char */
182 if (ctx->b_per_gop > 9)
183 ctx->b_per_gop = 9; /* ensure value won't take more than one char */
185 if (ctx->codec->height == 512 || ctx->codec->height == 608)
186 starting_line = 7; // VBI
187 else if (ctx->codec->height == 480)
190 starting_line = 23; // default PAL
192 size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
193 "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
194 (float)ctx->codec->bit_rate, ctx->p_per_gop, ctx->b_per_gop,
195 ctx->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, ctx->first_gop_closed == 1,
196 starting_line, ctx->codec->height / 16);
197 put_byte(pb, TRACK_MPG_AUX);
198 put_byte(pb, size + 1);
199 put_buffer(pb, (uint8_t *)buffer, size + 1);
203 static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
205 /* FIXME implement that */
206 put_byte(pb, 0); /* fields */
207 put_byte(pb, 0); /* seconds */
208 put_byte(pb, 0); /* minutes */
209 put_byte(pb, 0); /* flags + hours */
215 static int gxf_write_track_description(ByteIOContext *pb, GXFStreamContext *stream)
219 /* track description section */
220 put_byte(pb, stream->media_type + 0x80);
221 put_byte(pb, stream->index + 0xC0);
224 put_be16(pb, 0); /* size */
226 /* media file name */
227 put_byte(pb, TRACK_NAME);
228 put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
229 put_tag(pb, ES_NAME_PATTERN);
230 put_be16(pb, stream->media_info);
233 if (stream->codec->codec_id != CODEC_ID_MPEG2VIDEO) {
234 /* auxiliary information */
235 put_byte(pb, TRACK_AUX);
237 if (stream->codec->codec_id == CODEC_ID_NONE)
238 gxf_write_timecode_auxiliary(pb, stream);
243 /* file system version */
244 put_byte(pb, TRACK_VER);
248 if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
249 gxf_write_mpeg_auxiliary(pb, stream);
252 put_byte(pb, TRACK_FPS);
254 put_be32(pb, stream->frame_rate_index);
256 /* lines per frame */
257 put_byte(pb, TRACK_LINES);
259 put_be32(pb, stream->lines_index);
261 /* fields per frame */
262 put_byte(pb, TRACK_FPF);
264 put_be32(pb, stream->fields);
266 return updateSize(pb, pos);
269 static int gxf_write_material_data_section(ByteIOContext *pb, GXFContext *ctx)
272 const char *filename = strrchr(ctx->fc->filename, '/');
275 put_be16(pb, 0); /* size */
281 filename = ctx->fc->filename;
282 put_byte(pb, MAT_NAME);
283 put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
284 put_tag(pb, SERVER_PATH);
285 put_tag(pb, filename);
289 put_byte(pb, MAT_FIRST_FIELD);
294 put_byte(pb, MAT_LAST_FIELD);
296 put_be32(pb, ctx->nb_frames);
299 put_byte(pb, MAT_MARK_IN);
303 put_byte(pb, MAT_MARK_OUT);
305 put_be32(pb, ctx->nb_frames);
308 put_byte(pb, MAT_SIZE);
310 put_be32(pb, url_fsize(pb) / 1024);
312 return updateSize(pb, pos);
315 static int gxf_write_track_description_section(ByteIOContext *pb, GXFContext *ctx)
321 put_be16(pb, 0); /* size */
322 for (i = 0; i < ctx->fc->nb_streams; ++i)
323 gxf_write_track_description(pb, &ctx->streams[i]);
324 return updateSize(pb, pos);
327 static int gxf_write_map_packet(ByteIOContext *pb, GXFContext *ctx)
329 int64_t pos = url_ftell(pb);
331 gxf_write_packet_header(pb, PKT_MAP);
334 put_byte(pb, 0xE0); /* version */
335 put_byte(pb, 0xFF); /* reserved */
337 gxf_write_material_data_section(pb, ctx);
338 gxf_write_track_description_section(pb, ctx);
340 return updatePacketSize(pb, pos);
344 static int gxf_write_flt_packet(ByteIOContext *pb, GXFContext *ctx)
346 int64_t pos = url_ftell(pb);
349 gxf_write_packet_header(pb, PKT_FLT);
351 put_le32(pb, 1000); /* number of fields */
352 put_le32(pb, 0); /* number of active flt entries */
354 for (i = 0; i < 1000; ++i) {
357 return updatePacketSize(pb, pos);
361 static int gxf_write_umf_material_description(ByteIOContext *pb, GXFContext *ctx)
364 int fps = ctx->sample_rate / 2;
365 int frames = ctx->nb_frames / 2;
367 frames % fps << 24 | // frames
368 frames / fps % 60 << 16 | // seconds
369 frames / fps * 60 % 60 << 8 | // minutes
370 frames / fps * 3600 % 24 << 3; // hours
372 put_le32(pb, ctx->flags);
373 put_le32(pb, ctx->nb_frames); /* length of the longest track */
374 put_le32(pb, ctx->nb_frames); /* length of the shortest track */
375 put_le32(pb, 0); /* mark in */
376 put_le32(pb, ctx->nb_frames); /* mark out */
377 put_le32(pb, 0); /* timecode mark in */
378 put_le32(pb, timecode); /* timecode mark out */
379 put_le64(pb, ctx->fc->timestamp); /* modification time */
380 put_le64(pb, ctx->fc->timestamp); /* creation time */
381 put_le16(pb, 0); /* reserved */
382 put_le16(pb, 0); /* reserved */
383 put_le16(pb, ctx->audio_tracks);
384 put_le16(pb, 0); /* timecode track count */
385 put_le16(pb, 0); /* reserved */
386 put_le16(pb, ctx->mpeg_tracks);
390 static int gxf_write_umf_payload(ByteIOContext *pb, GXFContext *ctx)
392 put_le32(pb, ctx->umf_length); /* total length of the umf data */
393 put_le32(pb, 3); /* version */
394 put_le32(pb, ctx->fc->nb_streams);
395 put_le32(pb, ctx->umf_track_offset); /* umf track section offset */
396 put_le32(pb, ctx->umf_track_size);
397 put_le32(pb, ctx->fc->nb_streams);
398 put_le32(pb, ctx->umf_media_offset);
399 put_le32(pb, ctx->umf_media_size);
400 put_le32(pb, ctx->umf_user_data_offset); /* user data offset */
401 put_le32(pb, ctx->umf_user_data_size); /* user data size */
402 put_le32(pb, 0); /* reserved */
403 put_le32(pb, 0); /* reserved */
407 static int gxf_write_umf_track_description(ByteIOContext *pb, GXFContext *ctx)
409 int64_t pos = url_ftell(pb);
413 ctx->umf_track_offset = pos - ctx->umf_start_offset;
414 for (i = 0; i < ctx->fc->nb_streams; ++i) {
415 AVStream *st = ctx->fc->streams[i];
416 GXFStreamContext *sc = &ctx->streams[i];
419 switch (st->codec->codec_id) {
420 case CODEC_ID_MPEG1VIDEO: id= 'L'; break;
421 case CODEC_ID_MPEG2VIDEO: id= 'M'; break;
422 case CODEC_ID_PCM_S16LE: id= 'A'; break;
423 case CODEC_ID_DVVIDEO: id= sc->track_type == 6 ? 'E' : 'D'; break;
424 case CODEC_ID_MJPEG: id= 'V'; break;
427 sc->media_info= id << 8;
428 /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
429 sc->media_info |= '0' + (tracks[id]++);
430 put_le16(pb, sc->media_info);
433 return url_ftell(pb) - pos;
436 static int gxf_write_umf_media_mpeg(ByteIOContext *pb, GXFStreamContext *stream)
438 if (stream->codec->pix_fmt == PIX_FMT_YUV422P)
441 put_le32(pb, 1); /* default to 420 */
442 put_le32(pb, stream->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
443 put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
444 put_le32(pb, 1); /* I picture per GOP */
445 put_le32(pb, stream->p_per_gop);
446 put_le32(pb, stream->b_per_gop);
447 if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
449 else if (stream->codec->codec_id == CODEC_ID_MPEG1VIDEO)
453 put_le32(pb, 0); /* reserved */
457 static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *track)
459 /* FIXME implement */
460 put_be32(pb, 0); /* drop frame flag */
461 put_be32(pb, 0); /* reserved */
462 put_be32(pb, 0); /* reserved */
463 put_be32(pb, 0); /* reserved */
464 put_be32(pb, 0); /* reserved */
465 put_be32(pb, 0); /* reserved */
466 put_be32(pb, 0); /* reserved */
467 put_be32(pb, 0); /* reserved */
471 static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *track)
475 for (i = 0; i < 8; i++) {
481 static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *track)
483 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
484 put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
485 put_le32(pb, 0); /* number of fields over which to ramp up sound level */
486 put_le32(pb, 0); /* number of fields over which to ramp down sound level */
487 put_le32(pb, 0); /* reserved */
488 put_le32(pb, 0); /* reserved */
493 static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *track)
495 put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
496 put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
497 put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
498 put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
503 static int gxf_write_umf_media_description(ByteIOContext *pb, GXFContext *ctx)
509 ctx->umf_media_offset = pos - ctx->umf_start_offset;
510 for (i = 0; i < ctx->fc->nb_streams; ++i) {
511 GXFStreamContext *sc = &ctx->streams[i];
513 int64_t startpos, curpos;
514 int path_size = strlen(ES_NAME_PATTERN);
516 memset(buffer, 0, 88);
517 startpos = url_ftell(pb);
518 put_le16(pb, 0); /* length */
519 put_le16(pb, sc->media_info);
520 put_le16(pb, 0); /* reserved */
521 put_le16(pb, 0); /* reserved */
522 put_le32(pb, ctx->nb_frames);
523 put_le32(pb, 0); /* attributes rw, ro */
524 put_le32(pb, 0); /* mark in */
525 put_le32(pb, ctx->nb_frames); /* mark out */
526 strncpy(buffer, ES_NAME_PATTERN, path_size);
527 put_buffer(pb, (uint8_t *)buffer, path_size);
528 put_be16(pb, sc->media_info);
529 put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2);
530 put_le32(pb, sc->track_type);
531 put_le32(pb, sc->sample_rate);
532 put_le32(pb, sc->sample_size);
533 put_le32(pb, 0); /* reserved */
534 switch (sc->codec->codec_id) {
535 case CODEC_ID_MPEG2VIDEO:
536 gxf_write_umf_media_mpeg(pb, sc);
538 case CODEC_ID_PCM_S16LE:
539 gxf_write_umf_media_audio(pb, sc);
541 case CODEC_ID_DVVIDEO:
542 gxf_write_umf_media_dv(pb, sc);
545 gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
547 curpos = url_ftell(pb);
548 url_fseek(pb, startpos, SEEK_SET);
549 put_le16(pb, curpos - startpos);
550 url_fseek(pb, curpos, SEEK_SET);
552 return url_ftell(pb) - pos;
555 static int gxf_write_umf_user_data(ByteIOContext *pb, GXFContext *ctx)
557 int64_t pos = url_ftell(pb);
558 ctx->umf_user_data_offset = pos - ctx->umf_start_offset;
571 static int gxf_write_umf_packet(ByteIOContext *pb, GXFContext *ctx)
573 int64_t pos = url_ftell(pb);
575 gxf_write_packet_header(pb, PKT_UMF);
578 put_byte(pb, 3); /* first and last (only) packet */
579 put_be32(pb, ctx->umf_length); /* data length */
581 ctx->umf_start_offset = url_ftell(pb);
582 gxf_write_umf_payload(pb, ctx);
583 gxf_write_umf_material_description(pb, ctx);
584 ctx->umf_track_size = gxf_write_umf_track_description(pb, ctx);
585 ctx->umf_media_size = gxf_write_umf_media_description(pb, ctx);
586 ctx->umf_user_data_size = gxf_write_umf_user_data(pb, ctx);
587 ctx->umf_length = url_ftell(pb) - ctx->umf_start_offset;
588 return updatePacketSize(pb, pos);
591 #define GXF_NODELAY -5000
593 static int gxf_write_header(AVFormatContext *s)
595 ByteIOContext *pb = s->pb;
596 GXFContext *gxf = s->priv_data;
600 gxf->flags |= 0x00080000; /* material is simple clip */
601 for (i = 0; i < s->nb_streams; ++i) {
602 AVStream *st = s->streams[i];
603 GXFStreamContext *sc = &gxf->streams[i];
605 sc->codec = st->codec;
607 sc->media_type = codec_get_tag(gxf_media_types, sc->codec->codec_id);
608 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
609 if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
610 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
613 if (st->codec->sample_rate != 48000) {
614 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
617 if (st->codec->channels != 1) {
618 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
622 sc->sample_rate = st->codec->sample_rate;
623 av_set_pts_info(st, 64, 1, sc->sample_rate);
624 sc->sample_size = 16;
625 sc->frame_rate_index = -2;
626 sc->lines_index = -2;
629 gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
630 av_fifo_init(&sc->audio_buffer, 3*GXF_AUDIO_PACKET_SIZE);
631 } else if (sc->codec->codec_type == CODEC_TYPE_VIDEO) {
632 /* FIXME check from time_base ? */
633 if (sc->codec->height == 480 || sc->codec->height == 512) { /* NTSC or NTSC+VBI */
634 sc->frame_rate_index = 5;
635 sc->sample_rate = 60;
636 gxf->flags |= 0x00000080;
637 } else { /* assume PAL */
638 sc->frame_rate_index = 6;
640 sc->sample_rate = 50;
641 gxf->flags |= 0x00000040;
643 gxf->sample_rate = sc->sample_rate;
644 av_set_pts_info(st, 64, 1, st->codec->time_base.den);
645 sc->dts_delay = GXF_NODELAY;
646 if (gxf_find_lines_index(sc) < 0)
647 sc->lines_index = -1;
648 sc->sample_size = st->codec->bit_rate;
649 sc->fields = 2; /* interlaced */
650 switch (sc->codec->codec_id) {
651 case CODEC_ID_MPEG2VIDEO:
652 sc->first_gop_closed = -1;
655 gxf->flags |= 0x00008000;
657 case CODEC_ID_DVVIDEO:
658 if (sc->codec->pix_fmt == PIX_FMT_YUV422P) {
661 gxf->flags |= 0x00002000;
664 gxf->flags |= 0x00001000;
668 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
673 gxf_write_map_packet(pb, gxf);
674 //gxf_write_flt_packet(pb, gxf);
675 gxf_write_umf_packet(pb, gxf);
676 put_flush_packet(pb);
680 static int gxf_write_eos_packet(ByteIOContext *pb, GXFContext *ctx)
682 int64_t pos = url_ftell(pb);
684 gxf_write_packet_header(pb, PKT_EOS);
685 return updatePacketSize(pb, pos);
688 static int gxf_write_trailer(AVFormatContext *s)
690 ByteIOContext *pb = s->pb;
691 GXFContext *gxf = s->priv_data;
695 for (i = 0; i < s->nb_streams; ++i) {
696 if (s->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO)
697 av_fifo_free(&gxf->streams[i].audio_buffer);
700 gxf_write_eos_packet(pb, gxf);
702 url_fseek(pb, 0, SEEK_SET);
703 /* overwrite map and umf packets with new values */
704 gxf_write_map_packet(pb, gxf);
705 //gxf_write_flt_packet(pb, gxf);
706 gxf_write_umf_packet(pb, gxf);
707 url_fseek(pb, end, SEEK_SET);
711 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
715 for(i=0; i<size-4 && c!=0x100; i++){
717 if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
718 sc->first_gop_closed= (buf[i+4]>>6)&1;
720 return (buf[i+1]>>3)&7;
723 static int gxf_write_media_preamble(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt, int size)
725 GXFStreamContext *sc = &ctx->streams[pkt->stream_index];
726 int64_t dts = av_rescale_rnd(pkt->dts, ctx->sample_rate, sc->codec->time_base.den, AV_ROUND_UP);
728 put_byte(pb, sc->media_type);
729 put_byte(pb, sc->index);
731 if (sc->codec->codec_type == CODEC_TYPE_AUDIO) {
733 put_be16(pb, size / 2);
734 } else if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
735 int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
736 if (frame_type == FF_I_TYPE) {
739 } else if (frame_type == FF_B_TYPE) {
747 } else if (sc->codec->codec_id == CODEC_ID_DVVIDEO) {
748 put_byte(pb, size / 4096);
753 put_byte(pb, 1); /* flags */
754 put_byte(pb, 0); /* reserved */
758 static int gxf_write_media_packet(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt)
760 GXFStreamContext *sc = &ctx->streams[pkt->stream_index];
761 int64_t pos = url_ftell(pb);
764 gxf_write_packet_header(pb, PKT_MEDIA);
765 if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
766 padding = 4 - pkt->size % 4;
767 else if (sc->codec->codec_type == CODEC_TYPE_AUDIO)
768 padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
769 gxf_write_media_preamble(pb, ctx, pkt, pkt->size + padding);
770 put_buffer(pb, pkt->data, pkt->size);
771 gxf_write_padding(pb, padding);
773 if (sc->codec->codec_type == CODEC_TYPE_VIDEO)
774 ctx->nb_frames += 2; // count fields
776 return updatePacketSize(pb, pos);
779 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
781 GXFContext *gxf = s->priv_data;
783 gxf_write_media_packet(s->pb, gxf, pkt);
784 put_flush_packet(s->pb);
788 static int gxf_new_audio_packet(GXFContext *gxf, GXFStreamContext *sc, AVPacket *pkt, int flush)
790 int size = flush ? av_fifo_size(&sc->audio_buffer) : GXF_AUDIO_PACKET_SIZE;
794 av_new_packet(pkt, size);
795 av_fifo_read(&sc->audio_buffer, pkt->data, size);
796 pkt->stream_index = sc->index;
797 pkt->dts = sc->current_dts;
798 sc->current_dts += size / 2; /* we only support 16 bit pcm mono for now */
802 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
804 GXFContext *gxf = s->priv_data;
808 for (i = 0; i < s->nb_streams; i++) {
809 AVStream *st = s->streams[i];
810 GXFStreamContext *sc = &gxf->streams[i];
811 if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
812 if (pkt && pkt->stream_index == i) {
813 av_fifo_generic_write(&sc->audio_buffer, pkt->data, pkt->size, NULL);
816 if (flush || av_fifo_size(&sc->audio_buffer) >= GXF_AUDIO_PACKET_SIZE) {
817 if (!pkt && gxf_new_audio_packet(gxf, sc, &new_pkt, flush) > 0) {
819 break; /* add pkt right now into list */
822 } else if (pkt && pkt->stream_index == i) {
823 if (sc->dts_delay == GXF_NODELAY) /* adjust dts if needed */
824 sc->dts_delay = pkt->dts;
825 pkt->dts -= sc->dts_delay;
828 return av_interleave_packet_per_dts(s, out, pkt, flush);
831 AVOutputFormat gxf_muxer = {
833 NULL_IF_CONFIG_SMALL("GXF format"),
844 gxf_interleave_packet,